IOTA/IOTA-ES occultation update for (206) Hersilia / TYC 5257-00390-1 event on 2024 Oct 03, 08:11 UT Visible from Summary ------- On 2024 Oct 03 UT, the 99.063 km diameter asteroid (206) Hersilia will occult a 10.6 mag star in the constellation Aquarius for observers along a path across . In the case of an occultation, the combined light of the asteroid and the star will drop by 2.30 mag to 12.76 mag (the magnitude of the asteroid) for at most 9.750 seconds. This update is based on, astrometry for the asteroid kindly provided by the IAU Minor Planet Center. This work has made use of data from the European Space Agency (ESA) mission Gaia (http://www.cosmos.esa.int/gaia), processed by the Gaia Data Processing and Analysis Consortium (DPAC, http://www.cosmos.esa.int/web/gaia/dpac/consortium). Funding for the DPAC has been provided by national institutions, in particular the institutions participating in the Gaia Multilateral Agreement. The event at a glimpse ---------------------- * Rank: 100 * date and approx. time of event: 2024 Oct 03, 08:05 - 2024 Oct 03, 08:17 * geocentric midpoint of event [JD]: 2460586.84124050 * magnitude of target star: 10.60 * magnitude drop [mag]: 2.30 * estimated maximum duration [s]: 9.750 * Moon: 0 % sunlit, 153° distance * Sun: 160° distance * rough path description: The occultation path -------------------- * approximate projected width [km]: 181 * 1 sigma uncertainty interval [path widths]: +/- 0.03 * 1 sigma uncertainty interval [seconds]: +/- 2.0 * 1 sigma uncertainty interval approx RA,DE ["]: (+/- 0.015, +/- 0.006) * 1 sigma uncertainty ellipse (major, minor, PA): (0.016", 0.001", 70°) * approx speed of asteroid's shadow [km/s]: 10.1576 * website for maps: http://www.asteroidoccultation.com Path Coordinates: Occultation of TYC 5257-00390-1 by 206 Hersilia on 2024 Oct 3 Centre Star Star Sun Path Limits Error Limits Alt E. Longitude Latitude U.T. Alt Az Alt Limit 1 Limit 2 Limit 3 Limit 4 Crn o ' " o ' " h m s o o o o ' " o ' " o ' " o ' " Latitude Latitude Latitude Latitude 130 0 0 .. .. .... .. .. .. .. .. .. .. .. .. 29 31 10 .. .. .. 29 28 17 .... 131 0 0 30 14 1 8 17 6.7 1 98 8 31 4 20 29 24 49 31 7 20 29 21 57 .... 132 0 0 30 8 19 8 17 6.3 2 98 7 30 58 32 29 19 13 31 1 32 29 16 21 -1.11 133 0 0 30 3 23 8 17 5.7 3 99 6 30 53 30 29 14 23 30 56 30 29 11 31 -1.26 134 0 0 29 59 13 8 17 4.8 3 99 6 30 49 15 29 10 17 30 52 14 29 7 26 -1.33 135 0 0 29 55 49 8 17 3.6 4 100 5 30 45 47 29 6 57 30 48 46 29 4 6 -1.37 136 0 0 29 53 11 8 17 2.2 5 100 4 30 43 4 29 4 22 30 46 3 29 1 32 -1.40 137 0 0 29 51 18 8 17 0.5 6 101 3 30 41 8 29 2 32 30 44 7 28 59 42 -1.42 138 0 0 29 50 10 8 16 58.6 7 101 2 30 39 58 29 1 27 30 42 57 28 58 36 -1.44 139 0 0 29 49 47 8 16 56.4 8 102 1 30 39 34 29 1 6 30 42 32 28 58 16 -1.45 140 0 0 29 50 10 8 16 53.9 9 102 1 30 39 55 29 1 29 30 42 54 28 58 39 -1.46 141 0 0 29 51 18 8 16 51.2 9 103 0 30 41 3 29 2 38 30 44 1 28 59 47 -1.46 142 0 0 29 53 11 8 16 48.3 10 104 -1 30 42 56 29 4 30 30 45 54 29 1 39 -1.47 143 0 0 29 55 48 8 16 45.1 11 104 -2 30 45 34 29 7 6 30 48 32 29 4 16 -1.47 144 0 0 29 59 8 8 16 41.7 12 105 -3 30 48 56 29 10 26 30 51 54 29 7 35 -1.48 145 0 0 30 3 14 8 16 38.1 13 105 -4 30 53 4 29 14 30 30 56 2 29 11 39 -1.48 146 0 0 30 8 4 8 16 34.2 13 106 -5 30 57 57 29 19 17 31 0 55 29 16 26 -1.48 147 0 0 30 13 38 8 16 30.1 14 106 -5 31 3 34 29 24 48 31 6 33 29 21 57 -1.49 148 0 0 30 19 56 8 16 25.8 15 107 -6 31 9 56 29 31 2 31 12 55 29 28 11 -1.49 149 0 0 30 26 58 8 16 21.2 16 107 -7 31 17 2 29 37 59 31 20 2 29 35 8 -1.49 150 0 0 30 34 43 8 16 16.4 17 108 -8 31 24 53 29 45 39 31 27 53 29 42 47 -1.49 151 0 0 30 43 11 8 16 11.4 17 109 -9 31 33 28 29 54 2 31 36 28 29 51 10 -1.49 152 0 0 30 52 23 8 16 6.2 18 109 -10 31 42 46 30 3 8 31 45 47 30 0 16 -1.49 153 0 0 31 2 19 8 16 0.8 19 110 -11 31 52 49 30 12 56 31 55 50 30 10 4 -1.50 154 0 0 31 12 57 8 15 55.1 20 111 -11 32 3 35 30 23 27 32 6 37 30 20 34 -1.50 155 0 0 31 24 18 8 15 49.3 20 111 -12 32 15 5 30 34 40 32 18 7 30 31 46 -1.50 156 0 0 31 36 22 8 15 43.2 21 112 -13 32 27 18 30 46 35 32 30 21 30 43 41 -1.50 157 0 0 31 49 8 8 15 37.0 22 113 -14 32 40 14 30 59 12 32 43 18 30 56 17 -1.50 158 0 0 32 2 37 8 15 30.6 22 113 -15 32 53 54 31 12 31 32 56 58 31 9 36 -1.50 159 0 0 32 16 48 8 15 23.9 23 114 -15 33 8 16 31 26 31 33 11 21 31 23 35 -1.50 160 0 0 32 31 41 8 15 17.1 24 115 -16 33 23 21 31 41 13 33 26 27 31 38 17 -1.50 161 0 0 32 47 16 8 15 10.1 24 116 -17 33 39 9 31 56 36 33 42 15 31 53 39 -1.50 162 0 0 33 3 33 8 15 3.0 25 117 -18 33 55 39 32 12 40 33 58 46 32 9 42 -1.50 163 0 0 33 20 31 8 14 55.6 25 117 -19 34 12 52 32 29 25 34 16 0 32 26 26 -1.51 164 0 0 33 38 10 8 14 48.1 26 118 -19 34 30 46 32 46 51 34 33 55 32 43 51 -1.51 165 0 0 33 56 31 8 14 40.5 27 119 -20 34 49 23 33 4 56 34 52 32 33 1 56 -1.51 166 0 0 34 15 32 8 14 32.7 27 120 -21 35 8 41 33 23 43 35 11 51 33 20 42 -1.51 167 0 0 34 35 14 8 14 24.7 28 121 -22 35 28 40 33 43 9 35 31 52 33 40 7 -1.51 168 0 0 34 55 37 8 14 16.6 28 122 -22 35 49 20 34 3 14 35 52 33 34 0 12 -1.51 169 0 0 35 16 39 8 14 8.3 29 123 -23 36 10 42 34 24 0 36 13 56 34 20 56 -1.51 170 0 0 35 38 22 8 13 59.9 29 124 -24 36 32 44 34 45 24 36 36 0 34 42 19 -1.51 171 0 0 36 0 44 8 13 51.4 30 125 -24 36 55 27 35 7 27 36 58 44 35 4 21 -1.51 172 0 0 36 23 46 8 13 42.7 30 126 -25 37 18 50 35 30 9 37 22 8 35 27 2 -1.52 173 0 0 36 47 27 8 13 34.0 30 127 -26 37 42 53 35 53 30 37 46 12 35 50 22 -1.52 174 0 0 37 11 46 8 13 25.1 31 128 -26 38 7 35 36 17 28 38 10 56 36 14 19 -1.52 175 0 0 37 36 44 8 13 16.1 31 129 -27 38 32 57 36 42 4 38 36 19 36 38 53 -1.52 176 0 0 38 2 19 8 13 7.1 31 130 -28 38 58 58 37 7 17 39 2 21 37 4 5 -1.52 177 0 0 38 28 33 8 12 57.9 32 131 -28 39 25 37 37 33 7 39 29 2 37 29 54 -1.52 178 0 0 38 55 24 8 12 48.6 32 132 -29 39 52 54 37 59 33 39 56 21 37 56 19 -1.52 179 0 0 39 22 51 8 12 39.3 32 133 -29 40 20 49 38 26 36 40 24 18 38 23 20 -1.52 -180 0 0 39 50 55 8 12 29.9 32 134 -30 40 49 22 38 54 14 40 52 52 38 50 56 -1.53 -179 0 0 40 19 35 8 12 20.5 33 135 -30 41 18 31 39 22 27 41 22 3 39 19 8 -1.53 -178 0 0 40 48 50 8 12 11.0 33 137 -31 41 48 17 39 51 14 41 51 51 39 47 54 -1.53 -177 0 0 41 18 40 8 12 1.4 33 138 -31 42 18 38 40 20 36 42 22 14 40 17 14 -1.53 -176 0 0 41 49 5 8 11 51.8 33 139 -32 42 49 35 40 50 31 42 53 13 40 47 7 -1.53 -175 0 0 42 20 2 8 11 42.2 33 140 -32 43 21 6 41 20 58 43 24 46 41 17 33 -1.53 -174 0 0 42 51 33 8 11 32.5 33 141 -32 43 53 12 41 51 58 43 56 54 41 48 31 -1.54 -173 0 0 43 23 37 8 11 22.9 33 143 -33 44 25 51 42 23 29 44 29 35 42 20 0 -1.54 -172 0 0 43 56 12 8 11 13.2 33 144 -33 44 59 2 42 55 31 45 2 49 42 52 0 -1.54 -171 0 0 44 29 17 8 11 3.6 33 145 -33 45 32 46 43 28 3 45 36 35 43 24 30 -1.54 -170 0 0 45 2 53 8 10 53.9 33 146 -34 46 7 0 44 1 4 46 10 52 43 57 29 -1.54 -169 0 0 45 36 58 8 10 44.3 33 148 -34 46 41 46 44 34 34 46 45 40 44 30 57 -1.54 -168 0 0 46 11 32 8 10 34.7 33 149 -34 47 17 0 45 8 30 47 20 57 45 4 52 -1.55 -167 0 0 46 46 33 8 10 25.2 32 150 -34 47 52 43 45 42 54 47 56 42 45 39 13 -1.55 -166 0 0 47 22 0 8 10 15.7 32 151 -35 48 28 53 46 17 42 48 32 55 46 13 59 -1.55 -165 0 0 47 57 52 8 10 6.3 32 153 -35 49 5 30 46 52 56 49 9 35 46 49 11 -1.55 -164 0 0 48 34 9 8 9 56.9 32 154 -35 49 42 32 47 28 32 49 46 40 47 24 45 -1.55 -163 0 0 49 10 49 8 9 47.6 32 155 -35 50 19 59 48 4 31 50 24 9 48 0 41 -1.55 -162 0 0 49 47 50 8 9 38.4 31 156 -35 50 57 48 48 40 51 51 2 1 48 36 59 -1.56 -161 0 0 50 25 12 8 9 29.3 31 158 -35 51 35 58 49 17 30 51 40 15 49 13 36 -1.56 -160 0 0 51 2 53 8 9 20.4 31 159 -35 52 14 29 49 54 28 52 18 49 49 50 32 -1.56 -159 0 0 51 40 52 8 9 11.5 30 160 -35 52 53 19 50 31 43 52 57 42 50 27 44 -1.56 -158 0 0 52 19 8 8 9 2.8 30 161 -35 53 32 26 51 9 14 53 36 52 51 5 12 -1.56 -157 0 0 52 57 37 8 8 54.2 29 162 -35 54 11 48 51 46 58 54 16 17 51 42 54 -1.56 -156 0 0 53 36 20 8 8 45.7 29 164 -35 54 51 24 52 24 55 54 55 57 52 20 49 -1.57 -155 0 0 54 15 15 8 8 37.4 28 165 -34 55 31 11 53 3 3 55 35 48 52 58 54 -1.57 -154 0 0 54 54 18 8 8 29.2 28 166 -34 56 11 10 53 41 20 56 15 50 53 37 9 -1.57 -153 0 0 55 33 30 8 8 21.3 27 167 -34 56 51 16 54 19 45 56 55 59 54 15 31 -1.57 -152 0 0 56 12 47 8 8 13.5 27 168 -34 57 31 28 54 58 15 57 36 16 54 53 58 -1.57 -151 0 0 56 52 8 8 8 5.9 26 169 -33 58 11 45 55 36 49 58 16 36 55 32 30 -1.57 -150 0 0 57 31 31 8 7 58.4 26 171 -33 58 52 4 56 15 25 58 56 58 56 11 3 -1.57 -149 0 0 58 10 53 8 7 51.2 25 172 -33 59 32 22 56 54 0 59 37 20 56 49 36 -1.57 -148 0 0 58 50 13 8 7 44.2 25 173 -33 60 12 37 57 32 33 60 17 39 57 28 6 -1.58 -147 0 0 59 29 28 8 7 37.4 24 174 -32 60 52 47 58 11 2 60 57 52 58 6 33 -1.58 -146 0 0 60 8 35 8 7 30.8 23 175 -32 61 32 49 58 49 24 61 37 58 58 44 52 -1.58 -145 0 0 60 47 34 8 7 24.4 23 176 -31 62 12 41 59 27 38 62 17 54 59 23 4 -1.58 -144 0 0 61 26 20 8 7 18.3 22 177 -31 62 52 21 60 5 41 62 57 37 60 1 4 -1.58 -143 0 0 62 4 53 8 7 12.3 22 178 -31 63 31 45 60 43 31 63 37 5 60 38 52 -1.58 -142 0 0 62 43 9 8 7 6.6 21 179 -30 64 10 52 61 21 5 64 16 14 61 16 24 -1.58 -141 0 0 63 21 7 8 7 1.2 20 180 -30 64 49 37 61 58 23 64 55 3 61 53 40 -1.58 -140 0 0 63 58 43 8 6 55.9 20 181 -29 65 28 0 62 35 22 65 33 28 62 30 36 -1.58 -139 0 0 64 35 55 8 6 50.9 19 182 -29 66 5 56 63 11 59 66 11 28 63 7 11 -1.58 -138 0 0 65 12 42 8 6 46.1 18 183 -28 66 43 24 63 48 11 66 48 58 63 43 22 -1.58 -137 0 0 65 49 0 8 6 41.6 18 184 -28 67 20 21 64 23 58 67 25 58 64 19 8 -1.58 -136 0 0 66 24 48 8 6 37.3 17 185 -27 67 56 44 64 59 18 68 2 23 64 54 25 -1.59 -135 0 0 67 0 3 8 6 33.2 17 186 -27 68 32 31 65 34 7 68 38 13 65 29 13 -1.59 -134 0 0 67 34 44 8 6 29.3 16 187 -26 69 7 40 66 8 25 69 13 23 66 3 30 -1.59 -133 0 0 68 8 48 8 6 25.6 15 188 -26 69 42 8 66 42 9 69 47 53 66 37 14 -1.59 -132 0 0 68 42 14 8 6 22.2 15 189 -25 70 15 54 67 15 19 70 21 41 67 10 22 -1.59 -131 0 0 69 15 0 8 6 18.9 14 190 -25 70 48 56 67 47 51 70 54 43 67 42 54 -1.59 -130 0 0 69 47 4 8 6 15.9 13 191 -24 71 21 12 68 19 46 71 27 0 68 14 48 -1.59 -129 0 0 70 18 25 8 6 13.0 13 192 -24 71 52 40 68 51 1 71 58 29 68 46 3 -1.59 -128 0 0 70 49 3 8 6 10.3 12 193 -23 72 23 20 69 21 36 72 29 9 69 16 37 -1.59 -127 0 0 71 18 55 8 6 7.9 12 194 -23 72 53 11 69 51 29 72 59 0 69 46 31 -1.59 -126 0 0 71 48 1 8 6 5.5 11 195 -22 73 22 11 70 20 40 73 27 59 70 15 42 -1.59 -125 0 0 72 16 20 8 6 3.4 11 196 -22 73 50 20 70 49 8 73 56 7 70 44 10 -1.59 -124 0 0 72 43 53 8 6 1.4 10 197 -22 74 17 37 71 16 52 74 23 23 71 11 55 -1.59 -123 0 0 73 10 38 8 5 59.6 10 198 -21 74 44 2 71 43 52 74 49 48 71 38 56 -1.59 -122 0 0 73 36 35 8 5 57.9 9 199 -21 75 9 36 72 10 8 75 15 20 72 5 13 -1.59 -121 0 0 74 1 45 8 5 56.3 9 200 -20 75 34 19 72 35 40 75 40 0 72 30 46 -1.59 -120 0 0 74 26 8 8 5 54.9 8 201 -20 75 58 10 73 0 27 76 3 50 72 55 34 -1.59 -119 0 0 74 49 43 8 5 53.6 8 202 -19 76 21 11 73 24 30 76 26 48 73 19 39 -1.59 -118 0 0 75 12 32 8 5 52.4 7 203 -19 76 43 22 73 47 50 76 48 57 73 43 0 -1.59 -117 0 0 75 34 35 8 5 51.3 7 204 -19 77 4 44 74 10 25 77 10 16 74 5 37 -1.59 -116 0 0 75 55 52 8 5 50.3 6 205 -18 77 25 18 74 32 18 77 30 47 74 27 32 -1.59 -115 0 0 76 16 25 8 5 49.4 6 206 -18 77 45 5 74 53 28 77 50 31 74 48 44 -1.59 -114 0 0 76 36 15 8 5 48.6 6 207 -17 78 4 6 75 13 57 78 9 29 75 9 15 -1.59 -113 0 0 76 55 22 8 5 47.8 5 208 -17 78 22 23 75 33 45 78 27 42 75 29 5 -1.58 -112 0 0 77 13 47 8 5 47.2 5 209 -17 78 39 56 75 52 52 78 45 13 75 48 14 -1.58 -111 0 0 77 31 31 8 5 46.6 4 210 -16 78 56 48 76 11 20 79 2 1 76 6 45 -1.58 -110 0 0 77 48 36 8 5 46.1 4 211 -16 79 12 59 76 29 10 79 18 8 76 24 37 -1.58 -109 0 0 78 5 2 8 5 45.6 4 212 -16 79 28 30 76 46 22 79 33 36 76 41 52 -1.58 -108 0 0 78 20 52 8 5 45.2 3 213 -15 79 43 24 77 2 58 79 48 26 76 58 30 -1.58 -107 0 0 78 36 5 8 5 44.8 3 214 -15 79 57 42 77 18 59 80 2 40 77 14 33 -1.58 -106 0 0 78 50 44 8 5 44.5 3 215 -15 80 11 24 77 34 25 80 16 19 77 30 2 -1.58 -105 0 0 79 4 49 8 5 44.2 2 216 -15 80 24 33 77 49 17 80 29 24 77 44 57 -1.58 -104 0 0 79 18 22 8 5 44.0 2 217 -14 80 37 9 78 3 38 80 41 56 77 59 20 -1.58 -103 0 0 79 31 23 8 5 43.8 2 218 -14 80 49 14 78 17 27 80 53 58 78 13 12 -1.58 -102 0 0 79 43 54 8 5 43.6 2 219 -14 81 0 50 78 30 46 81 5 30 78 26 33 -1.58 -101 0 0 79 55 56 8 5 43.5 1 220 -13 81 11 56 78 43 35 81 16 33 78 39 25 -1.58 -100 0 0 80 7 30 8 5 43.4 1 221 -13 81 22 36 78 55 56 81 27 9 78 51 49 -1.59 - 99 0 0 80 18 37 8 5 43.3 1 222 -13 .. .. .. 79 7 50 .. .. .. 79 3 45 -1.59 - 98 0 0 80 29 18 8 5 43.2 1 223 -13 .. .. .. 79 19 17 .. .. .. 79 15 15 -1.60 - 97 0 0 80 39 34 8 5 43.2 0 224 -13 .. .. .. 79 30 19 .. .. .. 79 26 19 -1.61 - 96 0 0 80 49 27 8 5 43.2 0 225 -12 .. .. .. 79 40 56 .. .. .. 79 36 59 -1.68 - 95 0 0 .. .. .... .. .. .. .. .. .. .. .. .. 79 51 10 .. .. .. 79 47 15 .... - 94 0 0 .. .. .... .. .. .. .. .. .. .. .. .. 80 1 1 .. .. .. 79 57 9 .... - 93 0 0 .. .. .... .. .. .. .. .. .. .. .. .. 80 10 30 .. .. .. 80 6 40 .... - 92 0 0 .. .. .... .. .. .. .. .. .. .. .. .. 80 19 37 .. .. .. 80 15 50 .... Uncertainty in time = +/- 2 secs Prediction of 2023 Jul 15.6 Data for the target star ------------------------ * name: TYC 5257-00390-1 * constellation : Aquarius * BCRS position with proper motion to date of event [h,m,s ; °,',"] RA: 23 30 58.1513 DE: -06 34 26.313 * GCRS Astrometric position with proper motion and parallax to date of event [h,m,s ; °,',"] RA: 23 30 58.1511 DE: -06 34 26.315 * position source: Gaia DR3 * standard error: RA,DE [mas]: (0.200,0.100) * V mag [mag]: 10.6 * B mag [mag]: 11.0 * Diameter [mas]: 0.00 * remarks: Data for the minor planet ------------------------- * general information: (number) name: (206) Hersilia asteroid class: approx. diameter [km]: 99 approx. diameter ["]: 0.077 distance from Earth [AU]: 1.77250 asteroid position offset in RA [mas]: 0 asteroid position offset in DE [mas]: 0 * orbital information: orbit source: JPL#119 date of fit: 2023 Apr 24 source of used astrometry: MPC, JPL number of used observations: 0 number of rejected observations: 0 time covered by the observations: 1800 Jan 01 - 1800 Jan 01 1 sigma uncertainty ellipse (major, minor, PA): 0.016", 0.001", 70.295° remarks: * orbital elements for (206)Hersilia : Mean anomaly = 274.6143363764 deg Arg. of pericenter = 302.7710674924 deg Long. of node = 145.0291312607 deg Inclination = 3.7802768619 deg Eccentricity = 0.0400354020 Semimajor axis = 2.7395515211 AU Perihelion dist = 2.6298724747 AU Mag: H = 8.82, G = 0.15 Epoch of elements : MJD 60586.34124029 TDT (2024 Oct 03.3412) ------ occelmnt file for Occult BEGIN ----------------------------------- JPL#1192023Apr24,9.75,2024,10,3,8.189772,-0.371931,0.749118,-5.133102,-2.553611,0.001651,0.001037,0.000001,0.000001 -142.3076,-6.4358,54.38,-4.20,False TYC 5257-00390-1,23.51615315,-6.5739758,11.04,10.60,10.36,0.0,0,,23.53773467,-6.4358250,2.30,2.12,0,0,0 206,Hersilia,12.76,99.063,1.7725,0,0,-1.708,-12.67,,5.2,0 0,274.5402,2024,10,3,302.7711,145.0291,3.7803,0.04004,2.73955,2.62987,8.81,5.0,0.15 1.029,0.0160,0.0013,70,0.0023,Known errors,1.13,0,-1,-1 20241003_0390-1,60140.61 ------ occelmnt file for Occult END ----------------------------------- ============================================ Calculator (s): Steve Preston Date of update: 2023 Jul 15, 14:33 UT Steve Preston 7640 NE 32nd St Medina, WA 98039 stevepr@acm.org